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A pipet marked TD (the more common type of pipet) has been calibrated "to deliver" a specified volume of liquid.

These pipets have no base mark, the graduations continue onto the tip and are graduated to deliver which means that ALL the measured liquid in the pipet must be delivered.

A 5 mL. serological pipette with one-tenth milliliter graduations can be used to obtain any desired volume of liquid in one-tenth milliliter increments between 0.1 mL to 5.0 mL, although volumes smaller than 0.2 mL are best measured with automatic piptets.

To accurately transfer fluid with this type of pipet, the meniscus must be precisely on a calibration mark both at the beginning and at the end of a transfer.

Near the top of this type of pipet you will find the total volume indicated and the size of the smallest gradations (i.e., 5 mL in 1/10, the total volume of the pipet is 5 mL, and it is graduated in 1/10 mL increments).

When filling a pipet, the tapered end is held beneath the surface of the liquid at all times.

The liquid is drawn into the pipet by suction until the level is equal to or greater than the volume of liquid to be delivered.

Since serological pipets are labeled with the zero mark at the top of the pipet you will need to subtract the amount you are going to pipet from the total volume of the pipet to determine the exact mark to fill the pipet to.

For example if you are going to pipet 6.5 mL using a 10 mL pipet you would fill the pipet to the 3.5 mL mark. To determine the total volume of the pipet look near the top of this type of pipet.

Like many other common pieces of glassware, Erlenmeyer flasks could potentially be used in the production of illegal narcotics.

In an effort to restrict such production, some U.S. states (including Texas) have begun requiring permits to purchase such glassware, including Erlenmeyer flasks, as well as chemicals identified as common starting materials.